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<p>In this study, nanostructured adsorbents based on carbon nanotubes (CNTs) and graphene oxide (GO) were synthesized and functionalized with metal oxides (ZnO, CuO) and amino groups (–NH<sub>2</sub>) to evaluate their adsorption performance for carbon dioxide (CO<sub>2</sub>) and nitrogen oxides (NO<sub>x</sub>). GO–CuO–NH<sub>2</sub> exhibited the highest adsorption capacities, reaching 34.4&#xa0;mg&#xa0;g<sup>−1</sup> for CO<sub>2</sub> and 31.7&#xa0;mg&#xa0;g<sup>−1</sup> for NO<sub>x</sub>. Highly exothermic adsorption enthalpies (as low as − 48&#xa0;kJ&#xa0;mol<sup>−1</sup>), measured by microcalorimetry, confirmed strong interactions between the gas molecules and the functionalized surfaces. Structural, spectroscopic, and calorimetric analyses showed that adsorption performance depends on surface area, chemical functionality, and the presence of metal oxide clusters. Thermodynamic and kinetic modeling indicated a progressive adsorption process, driven by surface heterogeneity and the distribution of high-energy active sites. Importantly, this work offers new insights into the energetic landscape of gas–solid interactions by combining classical models with direct calorimetric evidence and provides a systematic framework for designing efficient adsorbents for environmental gas capture.</p>

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Synthesis and characterization of CNTs and GO functionalized with ZnO, CuO and amino groups for CO2 and NOx capture

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Carlos A. Guerrero-Fajardo,
  • Liliana Giraldo,
  • Juan Carlos Moreno-Piraján

摘要

In this study, nanostructured adsorbents based on carbon nanotubes (CNTs) and graphene oxide (GO) were synthesized and functionalized with metal oxides (ZnO, CuO) and amino groups (–NH2) to evaluate their adsorption performance for carbon dioxide (CO2) and nitrogen oxides (NOx). GO–CuO–NH2 exhibited the highest adsorption capacities, reaching 34.4 mg g−1 for CO2 and 31.7 mg g−1 for NOx. Highly exothermic adsorption enthalpies (as low as − 48 kJ mol−1), measured by microcalorimetry, confirmed strong interactions between the gas molecules and the functionalized surfaces. Structural, spectroscopic, and calorimetric analyses showed that adsorption performance depends on surface area, chemical functionality, and the presence of metal oxide clusters. Thermodynamic and kinetic modeling indicated a progressive adsorption process, driven by surface heterogeneity and the distribution of high-energy active sites. Importantly, this work offers new insights into the energetic landscape of gas–solid interactions by combining classical models with direct calorimetric evidence and provides a systematic framework for designing efficient adsorbents for environmental gas capture.